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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20e29669c0dae8b7d42dde889918856d96fea5a983dce376b08056059072c190' 
  AND token = 'Rqa+jKxMcVwrDFLAiXlNJzSlWAlGNLE3rJsEFs10VH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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