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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcfd87575d359228038a9b348f2da9029ddc5c0842acaa0acd1d8dd984853dc2' 
  AND token = 'SjfZ5weaKW/BRRxVzMgCdNrFdVKeLj6yYESQoURB9VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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