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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e429764f05cfb036109abefd4f8c6e0d127317bf1b20d528238d2b0d38ad55e' 
  AND token = 'Y4eElpLvJ8PLd3rTCgIRH0UUSou+jVfP1MX3ziOcelQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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