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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aca1ff63fd537629b7d0c54e876b9d5de6843f4cfa3bb6ceacb5c1ade9a9a355' 
  AND token = 'Z5Tu7w8cNtHGcJsAZvG6MFW09Q2gKdj4FRx9cJ36OsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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