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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09d1318396e0a8496790e59b2b011e023518136d9fbc59c1c61fc64b1105b106' 
  AND token = 'riE6taqmkx6v8F+A6pMVsAjEwp8MrNovu+huE94Ozoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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