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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b6b896e8d2f207c20271c6764f9f35ae3184cbbaf7af246d480bd568a0c52699' 
  AND token = '8R7AnLbYs2axLh5HwK/wPvpN2uvAilaFkPytFrW/fOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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