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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13e335f8e0d66022ae4c4a0e2893964c20d33bfb1f5d6766a8400e8b152b0974' 
  AND token = 'xSTKkevMAXkKHvOLbzICwfup8xFtToj0UWiCXhjoR2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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