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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cc2881e161f9f9b3f4ae04b9925909824bb322d7e490d589b9a74aa2154b9b7' 
  AND token = 'OTxeLUDe9lx2928h2gV95LRQAsXV2MbCoksvxI/uTz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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