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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f833f29fee7c7937d3252d2209085a92fd19b96608fc611186650818bf5898a' 
  AND token = 'Beea9tmTYs8X09cgFuNgZZKrZGoERcFGGPPPvPlscMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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