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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8af1b523864cfcbe7d5d4c46fe5d18e0c5106318b8eb9cc02c6503727687c133' 
  AND token = 'ZdK/a2th9fOlMiS39ZdK7Fsu9q07n6M+7BkNw/z/Me0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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