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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5800def890fe5201113a854e3e26f74ce5bdba1c04a0ddaaf95c92b90bd2ba5' 
  AND token = '7WLqAL/XXyLM7MV1bMBP9L4HLKZaJrItSP53Fk9KNGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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