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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9869f86c4cf5e7e1880c97e772763024a648f067d0cecda713e40bf3a148fcd2' 
  AND token = 'i43nHqpF+PY58OA7FWhKjkDSaSOYZcnNRS+xUYbeSzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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