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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f42a8b8bb931cb24e45e03e9081dad00e753aed2dbf1d1aa77abfe92c3e7ae39' 
  AND token = 'JPnK/3f/P/NNFWchJmF3qvktdicrUS4KfaWbcMNGaGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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