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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f07e8d4f4ac43ff84b336d55cd1495ce8f9f4185af5f3ff8a3f4c486a085addf' 
  AND token = 'P+S5Sj2vcAWn9XEWhv0ZHOAtTvhuPg9J3PStITFdnsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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