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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7f6cc9ba96714c3e43cd90dd4591df3e498369fed117ae37e2a9b9760654bbe' 
  AND token = 'Wu7YkIYrQQlV4qC0urOmBeH+QWsrtxUSyhhL+4FmC6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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