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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34e1fe047267559f0ffc13cf65b70d57ca5339343a4d932c4a40f95af0e40efb' 
  AND token = 'exr5ULqewzl4w50+p1DimsAqPEe045E94dmaojC4eio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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