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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14a1ddec9c79e220726be36c643a46389437ce4bccc60840044d9306f7cad11a' 
  AND token = 'E77AmmnQckhcJcHe74nfmE519e6sq6yiz+CK92uZiJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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