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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f25c456f0ba4476ae23ade5cdb281599ba9411c98585564db7007cc09f9c39c2' 
  AND token = 'Z5k7aY3ka7p0NsJyDGzpIg3zTR/tp4bBVUQimaw5fE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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