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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ee123679d8cdebe56dd54fee243b3a5759889b7f0a0e06bce72555bd208072d' 
  AND token = 'TbE6zbcBARGvWJDhax42+PdShn4cyu11PsK++m3TQtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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