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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '298282357d733a3c86c069fc6b73cf2bbce675c82b8a80151e21b74e567e8125' 
  AND token = 'G9tqt0o2K7s9w5yXg3dEOMtd/IXSHtmpZU4lD3Pt77I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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