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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '017db5aa8872ded14ddb0c0dec7f6180c0bec0fdb4b0e66183c5195dcf6f7a57' 
  AND token = 'rkUtIWM7OVP5F++yq8k+lj5ollDoFmlwOa2BRRttc5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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