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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76d637811068597883ebe7655a99804680b4a7130ca83582bc8c85d438a0ec62' 
  AND token = 'yq1XUeWOPHLo7B/XS/ybRa5v7HTxE1ZSfliINE1FUAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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