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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aa55a7dcce768db984d65702ebc3b8b6852c275277a75577859ad45a445bb15' 
  AND token = 's4UFlL0bobT3Xk93WsrPoYz3go6sdt+3iagbORQyIQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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