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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ace7b280a4d8a52bb3815e2434af0f9b0523021127ab864ff64970cb187a01b' 
  AND token = 'gcVosuYN8uA7EY7KMw4V2SoD5dkeFAjBAykRxg0+P1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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