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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52e1c0428f473b4b9fbda4a0e3bf01fe07e90739cd06d230a0e7311d0aa1d787' 
  AND token = 'ym9Lga9NgqTEW171sPd/eZRS8Pe8Qby5rEY7O3KlqC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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