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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed1da78cb7999287073257cc952ee8a64cf0acc3d76357c26070123f21b8f784' 
  AND token = 'yyNhWqUGSfC3oTmdPi4fnC/02airQosabQawcaVNpBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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