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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b2ce5d02ae043239bea0d7ac9d57275fd7814cfa5fa98c5a24847f6cf7fbb83' 
  AND token = 'bi2KqjFw39UcNq39AlS8/smQewcHXG631CbTTDDUI8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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