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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87c350a0cf132bed5808a0ecdb6583b6792dd8b6b50883f4157f5cb673e58355' 
  AND token = 'ODf04ZdQJkBBjq0dOpIN6ojehb8J7srNp0/nyUzclR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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