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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf1b3f3550468564ac2ddf03c39e37a0b69dd67d4283fa617d09cc35323c6327' 
  AND token = 'HUGsENNAXLQD6uIu+Ef8sDjK8B312a6T8OtsAzTFN2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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