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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0559d9f36c1471dce82f0e89410474f834810d0231da89a6a77a0daebd5c066' 
  AND token = 'V68X1zBnwF4lQmYf1OoTIKto+uJ1rexVctr8BbuELuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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