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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d9f86287c227fec07c509b0ce1d98b8d9683a3d25ee7e90a7070d8987ac21f6' 
  AND token = 'MLTyIKt1nxei2gluGoK+OZ7366wo5foJMogOkR2MXa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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