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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50a29aa660d900663ba1263d205aba4dde304497289dfd032b414f5b5d2d062f' 
  AND token = '1SCWPTKu2Yu9I+BsmZ5qjqePit61D4mB6C1AxrQrHuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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