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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca9edf9f075a258a4d7d37a4380b6db0c1e7639d76510dc03393f1751e1477fd' 
  AND token = 'vFgrFhvaZSAipt1YYsL9YZ7O/JChHhN6xF/o0wkiDpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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