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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '138a4f74973a3c9727e4923e8e5d7646e93e0f1e4c722296c83b56f001d03ae0' 
  AND token = 'WB3x3lC0deG4wvpTsBsqB+NfcQ0HT2x9bHh1Z/uRud8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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