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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '002592a0b849a401967cb1038c980b041ffad4e109f8568e137ff9883b0b5e09' 
  AND token = 'spcU7DT5Qu1F2OGvAsGJpKdTSz3CTP2QOhSKKV2SMAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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