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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86969727e900cd241d9f83a456b724c1dad2061b735876d3fb8688ba05eda075' 
  AND token = 'AI1tFuJbXbHpQp1QZhG1idSfWaa+CBYTCCqc0WfGA50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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