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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed5dc4225a0ead9792019165c62390ef09580b2509c4b217e581ac51d8d37ff7' 
  AND token = 'Fu/e+I/1rKol+dWqvrKV7C84SVM11fz0LyL3BXo4Ibk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}