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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79b5d4f1240f3867963c22724a783024c7d1d0984fa4e48437d3376470f5bf02' 
  AND token = 'rmnsZCWlCdGG0fdXz7M5UunGsNsF8ketrvqDdFnKYVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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