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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c77c1962dc3731e8d35b8d88e139e135c292fa3a689b857492e0cf823122da7a' 
  AND token = 'R5iJK49M0DYSEODjbDeb24LCNjAy4Moar5EGllZSd5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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