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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fac8cf5b2dee6668fd4bd1c8b68712d030403bb297e7d843604e7f0c815750d8' 
  AND token = 'xl/mNl+Qy9z0STVgl4hc9eVB82DY7cdJ29SMMQxdm7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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