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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b3852b5264ae4e7e530e5d3a1aee46964c91da3673c34450eb6be500087b7f7' 
  AND token = 'AWKDFeL9ApC0DxvjB6LtDCKE5iCi9jAAs80EPH0RzCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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