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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7eef813de668beda306d269620710cf2f7588bdb228dd5670b7071c2d8ac5799' 
  AND token = 'iLcEj72cHkcAdDFV/WjKNbz/2/zDoelKX9BjCG5cHEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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