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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33f7ad88d6317d89826a2884d7318e94ea8583dfd56f7271612fd6d22768a76f' 
  AND token = 'nqm0PmyY2EOTxL4VwkJLjNaI3Qka3Ntwen1ID9VdU3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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