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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e645395c2d2059523b50a704b8bb8862df292c0f21c938dea42bc1fe5bb00caa' 
  AND token = 'DgC2fx9cCDVz8lSPTi5ddFDfbBixodkJCOIH74Zw0ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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