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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d5c660819e87bd7d4e7e84c717c7b98e96f5fe50f90c07628da45a3ac1a6a0a' 
  AND token = 'dlKtEvboTpdSbsYTRqH/IG6rVhEZqfHnAivtZDlLp9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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