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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fab49d340ef760132f18729b81b2cda8a35420e8619254160c92b2862f1cf6c3' 
  AND token = '4agpkrR5TqDzusX9knLAgWTb6Hl74tenHfZxgPNLbXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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