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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bcb91e4d6e2ab680f8a7f0b65f35aa68785e97c495aa2a4a4dd4a9463454a34' 
  AND token = 'bEGSIcDQzIzFBeyR+w7RnnzHGX84PlmHKa70bYV8opE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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