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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46bfb8f71e6b0c16fe2b4d24bce0f8598eb463e304cf95bb9e1bea74006afc5f' 
  AND token = 'e1YaQUCi5KqPrFcjCRgboDAOj/ebZr9oHWIs+rID6RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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