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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1eda7f7aa6e321be069523b797512d1d55f566ed868ed577e2675026d8bfc7d' 
  AND token = 'pWWtUnnFoFrJl3ihH6vRlduXGO/c2PtRR6Y6te0xJXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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