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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '401ef1cd495aacdf23beeaf1e353d666ebcc3061989e7f523b86ad4a1b9f948a' 
  AND token = 'gHbXCvpMBd5SdTkuu2+0PKXem5r7nVM4AKrP2gFNTDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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