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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc52f9775d83eb2aacb3032b6458b0d3dd5e78d6ef530e902712ba3108d4728c' 
  AND token = 'eeQ2bGa3qZiG39kMyo4ViEwIE027P2Ahz+WcnRootsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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