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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbe64f0e845acd9ce3d6679c1158940a6410f60571ce822425d07335b985054f' 
  AND token = 'XRM74O7ixY7LEoYJOGgbD4DNfoH0okH8vi0CfhVKJCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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